The chitinase-like protein YKL-40 is secreted by airway epithelial cells at base line and in response to compressive mechanical stress.
Park JA, Drazen JM, Tschumperlin DJ. The chitinase-like protein YKL-40 is secreted by airway epithelial cells at base line and in response to compressive mechanical stress. J Biol Chem. 2010 Sep 24; 285(39):29817-25.